634429139 has 2 divisors, whose sum is σ = 634429140. Its totient is φ = 634429138.

The previous prime is 634429129. The next prime is 634429141. The reversal of 634429139 is 931924436.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634429139 is a prime.

Together with 634429141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 634429096 and 634429105.

It is not a weakly prime, because it can be changed into another prime (634429129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317214569 + 317214570.

It is an arithmetic number, because the mean of its divisors is an integer number (317214570).

Almost surely, 2^634429139 is an apocalyptic number.

634429139 is a deficient number, since it is larger than the sum of its proper divisors (1).

634429139 is an equidigital number, since it uses as much as digits as its factorization.

634429139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 634429139 is about 25187.8768259653. The cubic root of 634429139 is about 859.2661573827.

The spelling of 634429139 in words is "six hundred thirty-four million, four hundred twenty-nine thousand, one hundred thirty-nine".